Spheres

Question 1

continental

Answer 1

The outermost layer of Earth’s lithosphere that makes up the
Planet’s continents and
continental shelves are called contintial crust

Question 2

Oceanic

Answer 2

The outermost layer of Earth’s
lithosphere that is found under the
oceans are oceanic crust

Question 3

Two layers of the mantle

Answer 3

Upper and lower

Question 4

Two parts of the upper mantle are recognized as distinct regions in the Earth’s interior

Answer 4

lithosphere and the asthenosphere.

Question 5

Earth’s thin

Answer 5

Earth’s thin
outer shell is
broken into big pieces called
Ans- tectonic plates.

Question 6

Identification of plate boundaries

Answer 6

By observing the pattern of volcanoes and earthquakes.

By the mapping of spreading ocean ridges and growing mountain ranges.

Question 7

seafloor spreading

Answer 7

states that new oceanic crust forms at the
center of ocean ridges as mantle rises, melts, and erupts through underwater
volcanoes and then cool again.

Question 8

Abyssal plains

Answer 8

relatively flat

Question 9

Ocean ridges

Answer 9

submarine mountains

Question 10

Deep ocean trenches

Answer 10

narrow and deep troughs

Question 11

Inner core

Answer 11

mostly iron and solid

Question 12

Outer core

Answer 12

Molten iron

Question 13

Mantle

Answer 13

Mostly solid but soft rock

Question 14

Atmos

Answer 14

A blanket of gases

Question 15

Hydro

Answer 15

All water

Question 16

Centre of earth

Answer 16

hotter than the outside

Question 17

Heat flows through the

Answer 17

convection current

Question 18

Convetion current

Answer 18

where heated material moves from warm and high pressure to cooler places and low pressure.

Question 19

Convention currents within the
mantle

Answer 19

form due to thermal
expansion and contraction of rock.
As the mantle rock rise towards
the surface, it pushes on the crust.

As the heated rock reaches the top
of the mantle, it cools and sinks
under the force of gravity.

And the process repeats again.
This movement is called plate
tectonics and is the largest
convection current on the planet.

Question 20

Transform Boundaries

Answer 20

Plates slide past each other…earthquake occurs

Question 21

Constructive (Divergent) Boundaries

Answer 21

*As the plates move apart, hot mantle rises to fill in the middle and partially melts due to decrease in pressure
new oceanic crust is created
he boundaries are known as constructive plate boundaries

Question 22

divergent

Answer 22

2 contenential is volcano
2 ocean sea floor spreading, mid ocean ridge